US PATENT SUBCLASS 235 / 454
.~.~ Optical

Current as of: June, 1999
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235 /   HD   REGISTERS

435  DF  CODED RECORD SENSORS {9}
439  DF  .~ Particular sensor structure {8}
454.~.~ Optical {10}
455  DF  .~.~.~> Light level control
456  DF  .~.~.~> Multiple column code
457  DF  .~.~.~> Holographic
458  DF  .~.~.~> Perforated record {2}
462.01  DF  .~.~.~> Bar code {20}
468  DF  .~.~.~> Invisible
469  DF  .~.~.~> Color coded
470  DF  .~.~.~> With scanning of record {1}
472.01  DF  .~.~.~> Hand-held (e.g., portable) {2}
473  DF  .~.~.~> Light pipes

DEFINITION

Classification: 235/454

Optical:

(under subclass 439) Subject matter wherein the coded indicia on the record is sensed by transmitting light through or reflecting light from the record surface, the light detected being converted into an electrical signal representative of the indicia.

(1) Note. The subject matter in this subclass and those indented hereunder differs from that found in Class 250 in that the light detected is converted to an electrical signal which is further processed by particular circuitry, the particular circuitry including the generating and utilization of timing and sync signals, the storage of signals, and means to perform counting operations.

SEE OR SEARCH CLASS

250, Radiant Energy,

566+, for optical or pre-photocell systems only used to read coded records, and subclass 555 for photocell controlled circuits wherein a coded card is read.